Laquer bullet gun barrel

ABSTRACT

A lacquer bullet gun barrel, having a barrel case, concentrically surrounding a boring and having a rear end that is fastened to a front end of a gun case. The rear end of the barrel case has a cavity, receiving an insertion tube, which has a diameter equal to said boring and is aligned with said boring on a common axis. With this assembly, lacquer bullets tightly fit into the insertion tube, so that gas drives lacquer bullets therein with high pressure. Aligning the insertion tube with the boring ensures firing precision and an increased firing range.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a lacquer bullet gun barrel, particularly to a lacquer bullet gun barrel which can be disassembled.

[0003] 2. Description of Related Art

[0004] Lacquer bullet guns currently on the market each work basically by driving lacquer bullets through a barrel to be fired. The lacquer bullets that are fired are of comparatively small weight, made of elastic material and contain coloring matter. Barrels for driving lacquer bullets are therefore different from barrels of regular guns or of air guns firing hard bullets.

[0005] As shown in FIG. 3, a conventional lacquer bullet gun barrel comprises: a gun case 1; a barrel 2 on a front end of the gun case 1; a pressured-gas container 3, providing pressurized gas for firing lacquer bullets 5; and a feeding mechanism 4, set on an upper side of the gun case 1, accommodating the lacquer bullets 5 and feeding the lacquer bullets 5 to be fired into a bullet chamber 6 inside the gun case 1. The bullet chamber is located at a rear end of the barrel 2 and contains a firing device 7. The firing device 7 is driven by pressurized gas for ejecting the lacquer bullets 5 through the barrel 2.

[0006] Referring to FIG. 4, the conventional barrel 2 has a long and narrow firing path. When forming the firing path in the barrel in a lathe or by drilling, working and cost limitations restrict the length of the firing path. Therefore, the barrel 2, conventionally made of a single body, is relatively short, which reduces speed of fired bullets and limits firing range thereof.

[0007] Since working a barrel having a single body is difficult, barrels with two sections have been developed, as shown in FIG. 5. In this design, a barrel 2A has a front section 8A and a rear section 9A. The front section 8A and the rear section 9A are connected by threads. The rear section 9A has a smaller diameter than the front section 8A and also has a diameter that is slightly smaller than the diameter of the lacquer bullets 5. When a lacquer bullet 5 enters the rear section 9A of the barrel 2A, a tight connection thereof with the rear section 9A is established, and the lacquer bullet 5 is driven forward by large pressure. While gliding inside the rear section 9A, the lacquer bullet 5 is compressed. The front section 8A has a slightly larger diameter than the rear section 9A. Consequently, pressure experienced by the lacquer bullet 5 is smaller, and the original shape of the lacquer bullet 5 is restored, while friction is reduced. Thus the lacquer bullet 5 in the front section 8A is driven by pressure and accelerated.

[0008] Undergoing large pressure in the barrel 2A, the lacquer bullet 5 gains a large momentum. In the event of bursting of the lacquer bullet 5, the barrel 2A allows to be cleaned in two sections. However, since the front and rear sections 8A, 9A are connected in the middle of the barrel 2A and are not perfectly fitting together, there is no common axis of the front and rear sections 8A, 9A, and a lacquer bullet 5 inside the barrel 2A does not follow a straight path, so that precision and stability of firing are insufficient, and no stable target is aimed at. Furthermore, lacquer bullets easily burst in the barrel 2A.

SUMMARY OF THE INVENTION

[0009] It is the main object of the present invention to provide a lacquer bullet gun barrel which is easy to manufacture, lowering production cost and production failure rates.

[0010] Another object of the present invention is to provide a lacquer bullet gun barrel which is easily disassembled and conveniently cleaned in the event of a burst lacquer bullet.

[0011] A further object of the present invention is to provide a lacquer bullet gun barrel of higher precision and an extended firing path.

[0012] The present invention can be more fully understood by reference to the following description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013]FIG. 1 is a sectional side view of the lacquer bullet gun barrel of the present invention when assembled and mounted.

[0014]FIG. 2 is a sectional side view of the lacquer bullet gun barrel of the present invention when disassembled.

[0015]FIG. 3 is a sectional side view of a conventional gun case and barrel for firing lacquer bullets in conjunction with an air gun.

[0016]FIG. 4 is a sectional side view of a conventional lacquer bullet gun barrel in a single body.

[0017]FIG. 5 is a sectional side view of a conventional lacquer bullet gun barrel which can be disassembled.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0018] As shown in FIGS. 1 and 2, the lacquer bullet gun barrel of the present invention mainly comprises: a barrel case 10, concentrically surrounding a boring 11, through which lacquer bullets 5 pass when fired. The barrel case 10 has a rear end carrying an outer thread 12 for establishing a connection with a gun case 20 of a lacquer bullet gun. The barrel case 10 is thus mounted on a front end of the gun case 20.

[0019] The main characteristic of the present invention is that the barrel case 10 has a rear section with an inner cavity 13 into which an insertion tube 30 is inserted. The insertion tube 30 has a rear end with an opening where lacquer bullets 5 enter the insertion tube 30. The insertion tube 30 has an inner diameter that is equal to the diameter of the boring 11. Thus, after connecting the barrel case 10 with the insertion tube 30, a complete barrel is formed for firing lacquer bullets.

[0020] The insertion tube 30 is made of material with low friction, like copper alloy, carbon fibers or nylon fibers. Lacquer bullets 5 inside the insertion tube 30 are tightly connected with the insertion tube 30, so that maximum pressure is built up for driving lacquer bullets 5. Furthermore, the material of the insertion tube 30 has a low friction coefficient, so friction inside the barrel is reduced, and lacquer bullets 5 are fired with increased speed. With fine working of the cavity 13 and the insertion tube 30, high precision is achieved, so that the insertion tube 30, having been inserted into the cavity 13, is aligned with the boring 11 in the barrel case 10.

[0021] Referring to FIG. 2, for mounting the barrel case 10 on the lacquer bullet gun, first the insertion tube 30 is inserted into the cavity 13 at the rear end of the barrel case 10, then the barrel case 10 with the insertion tube 30 is screwed into an inner thread at the front end of the gun case 20 and fastened there. When the barrel case 10 is deeply screwed in, the rear end of the insertion tube 30 leans against a mounting seat 21, so that the insertion tube 30 and the barrel case 10 are connected with each other.

[0022] For dismounting and cleaning the barrel case 10, the barrel case 10 is removed from the mounting seat 21, then the insertion tube 30 is taken out of the barrel case 10, and the barrel case 10 and the insertion tube 30 are cleaned separately.

[0023] Above design of the present invention of separately working, then assembling the insertion tube 30 and the barrel case 10 results in the boring 11 being short and following a straight line. Working the boring 11 is relatively simple. The insertion tube 30 is relatively short and easily workable, as well. Thus the present invention reduces working cost and effort, and production failure does not easily occur.

[0024] Furthermore, since the barrel case 10 and the insertion tube 30 are separable, in the event of a burst lacquer bullet inside the barrel the insertion tube 30 is taken out of the barrel case 10, and cleaning thereof is performed separately. Cleaning is thus simplified, allowing to remove bullet fragments and coloring matter thoroughly.

[0025] In comparison with a conventional lacquer bullet gun barrel that is screwed or glued together, the present invention, with the insertion tube 30 inserted into the cavity 13 of the barrel case 10, has the insertion tube 30 and the cavity 13 fine-worked and automatically aligned. There will be no bend due to a mismatch of inner and outer threads, but rather a high degree of precision and good alignment of the insertion tube 30 and the cavity 13 of the barrel case 10. The insertion tube 30 and the boring 11 in conjunction form a straight firing path without bend, ensuring that lacquer bullets 5 proceed in a straight line within the barrel case 10, leading to improved accuracy of firing lacquer bullets.

[0026] Above explanation shows that the present invention has the following advantages:

[0027] 1. Convenient working ensures a firing path of lacquer bullets with minimal bending.

[0028] 2. Assembly of the firing path is done by insertion, no screws and no gluing are required.

[0029] 3. The firing path is straight, so lacquer bullets will not easily burst therein.

[0030] 4. The straight firing path ensures improved precision and an increased firing range.

[0031] 5. In the event of a burst lacquer bullet, opening and cleaning is convenient.

[0032] While the invention has been described with reference to a preferred embodiment thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention which is defined by the appended claims. 

1. A lacquer bullet gun barrel, comprising: a barrel case, concentrically surrounding a boring and having a rear end that is fastened to a gun case of an air gun, said rear end receiving an insertion tube, which has an opening with a slightly smaller inner diameter than said boring and is aligned with said boring on a common axis.
 2. A lacquer bullet gun barrel according to claim 1, wherein said rear end of said barrel case has a cavity for inserting said insertion tube, with said insertion tube having an outer periphery that fits precisely in said cavity. 